Valve gear



A. E." HALL VALVE GEAR ocms, 1928.

Filed Sept. 27, 1919 4 SheetsSheet l I N VEN TOR. fide/beflf I B Y Oct.16, 1928. 1,687,557

. A. E. HALL VALVE GEAR Filed Sept. 27, 1919 4 Sheets-Sheet 2 TTORNEY A.E. HALL Oct. 15, 1928.

VALVE GEAR Filed Sept. 27, 1919 4 Sheets-Sheet 5 NVENTOR.

Oct. 16, 1928.

4 Sheets-Sheet- 4 INVENTOR. fi de/ier/ f 170/4 A TTORNEYS Patented Oct.16, 1928-,

ADELE-133371? ALL O self; 913%, immeasvaLV @155 Applicationfijledseptemb er 27,1919. serial no. ae,7ea.

This invention relates to improvements in I valve gear, and moreparticularly to the valve gear as used on railroad locomotives.

i at the ends ofthe stroke thereby longer port opening.

A still further object isto mount it rigidly V on the frame, andsimplify the valve gear'by eliminating a number of .partsWhich are usedin making up the valve gear which is now in general use.

With theabove and other objects in view, the present invention consistsinthe combi-' nation and arrangement of parts hereinafter more fullydescribed, illustrated in the accompanying drawings,fland moreparticularlypointed out in the appended claims, it.

being understood that changes may be made in the form size, proportionand minor details without departing from the spirit or sac any of theadvantages of the inven{ tion. I In the drawings:

' Fig. 1 is a fragmentary sideview of a locomotive with improved valvegear in place thereon. i

2 is a top plan view thereof showing it applied to both valves. Fig.3 isan end view of the valve gear. Fig. dis a detailaof the control leversin two positions, the dotted lines showing the gosahead position. a

Figure 5 is an elevation of a portion of the valve mechanism showlng thesame 1n two posit ons and illustrating the manner in which the valve' iscausedto pause: or dwell,

Figure 6 is a detail transverse sectional view takenthrough the main rodatthe rear of the crosshead m Fig. 5 partly section.

' F re 7 s a e vati n Pa tly n. eqtiqa showing the valve gear mechanismin two positions. 1

Figu i a e ai P r pectiv V e f the bell crank lever. I

gure 9 is aet rasp t View o the link which connects the bell crank leverwith the main rod. 9 5

Referring now. more, particularly to, the drawings, in which isillustrated the pre% ferred embodiment ofthe invention, 3 desi nates, alocomotive cross head which slid;- ablymounted in'and giiided by a frame'e'dr th e'usual constructionf Apitman or main rod 5 pivotally connectedat its frontiend with thecross head and atitS rear' end with the drivewheels 4.. usu alvalves 6, are of the ordinary construction and formpart of the present invention. i Rigidly mountedon the frames 7 are thebrackets 8 extending reai'w ardly from the frame, and it will befreadilyunllerstoodthat the frames 7- are located ne on each s idel of theb01161, a r c nnect d wer iii any suitable manner.

Pivotallymounted onthe cross headb at the point 9 is a connecting rod mextending rearwardly from the cross head to thelower end of a cross headlever 11 and pivoted at this rear end'tothelatter by a pin 12. Thislever 11 which is actuated by the cross head 3' extends upwardly and haspivoted to it at a point intermediate of its e'n ds, the lower end of aradius link 13, the upper end of the said link being connected to areversing arm rent the point 15. The, upper end of the reversing arm letis connected to the front end of areach rod16 and'the lower end of there versing arm is rigidly set on a transverse shaft 17 extending underthe boiler from one side' of the locomotive to the other. The res verseshaft 17is journaled in outerbearin'gs of curved rearwardly extendingportions of th br e 8. I ,7

The bracket s 8 are provided at points in: termediate of their ends with"transversely aligned bearings 18 in which arejournaled transve elydisposedinterlocking areas 19;.

aridlQ, each consisting of ambanrsenon and a reduced solidsec'tioniThese shaftsare I of like construction andeach shaft bases "re ducedsolid portion extending through the tubular fporaen'ef the othershaftand journaled in the same. By epnstni'ggtion the shafts 19 and'19operate on a common axis tions of the shafts 19 and 19 and have bifuroated outer or free ends in which are pivoted the upper ends of crosshead levers 11. Each shaft is connected ,at one end with one of thecross head levers 11 and at the other end with a combination lever 23 bymeans of an arm The arms 20 de pend from the reduced solid portionsofthe shafts l) and 19 and are pivotally connected to the upper ends ofthe combination levers 23. Piv'otally mounted on the crosshead 3 at thepoint 25. is a bell crank lever 26consisting of an approximatelyhorizontal rearwardly extending short arm and a depending rela- 'tivelylong approximatelyvertical arm. The lower end 0f:th e depending verticalarm of the bell crank lever 26 is connected by a link 27 with thelowerend of thecombination lever23, and the shortupperarm of the bellcrank lever 26 is connected to the pit'man or main rod 5 at 28by meansof a link29. The

ValVerodBO is also pivoted to the upper portion of the combination lever23 at 31, a short distance from the upper end of the said combinationlever 23. It will thus be obvious that the bell crank lever 26 will beoscillated on its pivot of the crosshead 3. by the pitman ormain rod 5and that when the crank end of the drive wheel is moving backwardly orforwardly and is carrying with it the main rod 5, there will be littleor no movement of the bell crank lever 26, but at the end of the strokeof the main rod 5 the vertical or up and down movement of the crank orwrist pin of the drive wheel will produce a rapid upward ordownwardmovement of the main rod 5 and a consequent rapid movement ofthe bell crank lever 26. It'will be clear that this will produce a rapidopening and closing movementof the valve and cause the same to dwell orpause between the openlng and closmg movement and will also result 111 arapid ort 0 enin and closin and cause the steam to act on the piston amaximum length of time during each stroke. o r I Inthe illustration asshown in 1 the mechanism-is in the reverse position while as shown inthe dotted lines in Fig. 4 the mecha-.

. :nism is in the go-ahead position, whichwill of course admit the steamto the opposite side of'the piston. I r

V InFigure 5 of the drawings the valve gear is illustrated in twopositions to show that, the

valve will dwell at lead positions. When the mainrod 5 is in theposition shown in full lines in Figure 6, the cross head. and othermechanism is in theposition as shown, and

as the wheels revolve and the main rod 5' assumes the position shown indotted lines the cross head, together withthe bell crank lever 26 andthe link 29, will also assume the positions shown in dotted lines; '1 1eend 26" of the bell crank lever 26 will not move longitudinally due tothe fact that the link 29, which is secured to the main rod, rocks thebell crank lever 26 on the pivot 25 so that the point 26 does not movein a longitudinal direction, even thoughthe cross head does travel backa limited distance as shown in dotted lines. r

F rom the foregoing description it will be seen that I have perfected anextremely simple and effective valve gear, eliminating a number of partssuch asthe radial link, the eccentric or secondary crank onthe mainwrist pin, eccentric rods and bell cranks used on the types of valvegear now in general use, anditcwill be observedthatathe movement of thevalve is entirely controlled by the cross heads and eliminates allerrors caused from driving axle oscillations, 1 a 7 l 1. In combinationwith a locomotive engine, a valve gear includingvtransverse coaxiallyarranged shaftsfadapted tofextendacross the-engine and each consistingof a reduced section and a tubular section, of substantially uniformlength having their adj acent ends spaced apart at the center of eachshaft, thetubular section of each shaft being sleeved. onthe reducedsection of the other shaftand the said shafts being provided withoppositely bowed portions rigidly connecting the reduced and tubularsectionsof each shaft with each other, means located at opposite sidesofthe engine for connecting the said shafts with the'crossheads of theengine, combination levers located at opposite sides of the locomotiveand connected with the said shafts, and meansfor connecting thecombination leverswith' the main rods of the locomotiveand with theengine valves, said coInthe reduced section of the other shaft saidsections being of a substantially uniform length and spaced apart :attheir adjacent ends at; the. center of each shaft, and bowed portionsrigidly connectingjthe sections of each shaft with each other, crossheadlevers located-at opposite sides of the engineand connected with thecrossheads "of the latter, armsextendingfrom theshaft andpivoted to thecrosshead levers and connecting-one of the S8Ct1OIlS ()f,fl.Cl1 shaftwithone of the cross head levers, and means for connecting the tubularsectionofeach shaft being sleeved-onv other section of each shaft withone 'of'the rigidly connecting the sections of each shaft with eachother, means located at opposite sides of the locomotive engine forconnecting one of the sections of each shaft with one of the crossheadsof the engine, said means including a crosshead lever pivotedintermediate of its ends, a link connecting one end of the crosshead'lever with one of the crossheads, an arm extending from one of theshafts and connected to the other end of the crosshead lever, means forconnecting the other section of each shaft with one of the main rods ofthe engine for supplying lap and lead motion, and reversing mechanismconnected with the crosshead levers.

4:. In combination with a locomotive engine, a valve gear includingtransversely disposed coaxially arranged shafts having interfittingreduced and tubular sections, said sections being of substantiallyuniform length and having their adjacent ends spaced apart at the centerof each shaft, and central con- Ilecting portions rigidly connecting thesections ofeach shaft with each other, means for connecting one sectionof each shaft with a crosshead of the engine, the lattermeans comprisingan arm carried by such section, a crosshead lever located in rear of theadjacent crosshead and extending above the adjacent main rod of thelocomotive and pivoted at its upper end to the said arm, and aconnecting rod extending from the lower endof the adjacent crosshead andpivoted to the same, means for connecting the other section of eachshaft with a main rod of the engine for supplying lap and lead motion,and reversing mechanism having a radius link connected to the crossheadlever intermediate of the ends thereof at each side of the engine.

5. In combination with a locomotive engine, a valve gear includingtransversely disposed coaxially arranged shafts extending across theengine, said sections being of substantially uniform length and havingtheir adjacent ends spaced apart at the center of each shaft, andcentral connecting portions rigidly connecting the sections of eachshaft with each other, means for connecting one of the sections of eachshaft with the adjacent crosshead of the engine and means for con-,necting the other section of the shaft with one of the main rods of theengine, the latter means comprising a shaft arm, a combination leverpivoted to said arm, and a link connecting the combination lever withthe adjacent main rod,'and means for'connectingth'e combination leverswith the valves of the en 6. In a locomotive engine, a valve gear 1n=eluding transversely disposed coax ally as-'- ranged shafts extendingacros'sthe engine,

said sections be'ingof substantially uniform lengtlraind' having theiradj aeentends spaced apart at the center of each shaft, andcentralconnecting portions rigidly connecting the sections of each shaft witheach other, means for connecting each of the shafts with one of thecrosshe'ads of the engine, and separate means for connecting each of thesaid shafts with a main rod of the engine, the latter means comprising ashaft arm, a combination lever pivoted to said arm, and a leverpivotwith the adjacent main rod and with the com bination lever andmeans for connecting the combination levers with the valves of theengine.

7. In combination with a locomotive engine, a valve gear comprisingbrackets located at opposite sides of the engine and provided withintermediate and terminal bearings, coaxially arranged transverse shaftsjournaled in the intermediate bearings of the said brackets, saidsections being of substantially uniform lengthand having their adjacentends spaced apart at the center of each shaft, and central connectingportions rigidly connecting the sections of each shaft with each other,means for connecting each of the shafts with one of the crossheads ofthe engine, said means including shaft arms, crosshead levers pivoted tothe said arms and connecting rods extending from the crossheads to thecross head levers, reversing mechanism including a transverse reverseshaft journaled in the terminal bearings of the said brackets andprovided with reverse arms and radius'links connecting the reverse armswith the-crosshead levers, and combination levers connected with thesaid shafts and wit-h the main rods of the engine for supplying lap andlead motion. i

8. In combination with a locomotive engine, a valve gear comprisingaligned brackets located at opposite sides of the locomotive,transversely disposed co-axial shafts extending across the engine andeach consisting of a reduced section and a tubular section ofsubstantially uniform length, and having their adjacent ends spacedapart at the center of the shafts, the tubular section of each shaftbeing sleeved on the reduced section ofthe other shaft and journaled inone of thesaid brackets, and the said shafts being provided at theircenters with oppositely bowed portions rigidly connecting the sectionsof each shaft, a crosshead lever located in rear of the adjacent crosshead and extending above the adjacent main rod of the locomotive, an armextending from one of the shafts and pivoted ver with the adjacentcrossheacl, a combina- 7 tion lever, a shaft arm connected with theothershaft and pivoted to the upper end of the combination lever; asubstantially L- shapecl lever pivotally mounted on the adjacenterosshead, links connecting the arms ofthe L-shaped lever with theacljacentmain rod and with the combination lever,means for connectingthe combination lever with the valve of the locomotive and reversingmechanism having a raclins link connected -Wlt-h th 8 crossheadlever. c-

In testimony whereof I ai'fix my signature.

ADELBERT EVHALLR

